Colorimeter Removal: 1) Stop the flow of sample water.
2) Shut the power to the CL17 off by using the power switch, located to the left of the colorimeter.
3) Disconnect all tubing from the front of the colorimeter.
4) Disconnect the drain tube at the barb fitting on the inside of the instrument enclosure at the bottom of the instrument.
5) Remove the two screws on the front of the colorimeter assembly.
6) Gently pull the colorimeter towards you, pulling it off the main circuit board. Once the colorimeter is disconnected from the circuit board, carefully remove the drain tube, which is connected to the back of the colorimeter.

Colorimeter Reinstallation: 1) Perform the removal procedure in reverse. Be careful, do not force or bend the pins on the back of the colorimeter.
2) Secure the new colorimeter by tightening the two screws.
3) Reconnect the drain tube at the bottom of the instrument.
4) Reconnect the sample and reagent lines to the front of the colorimeter.
5) Install a stir bar into the colorimeter.
6) Restore power to the CL17 by using the power switch, located to the left of the colorimeter.
7) Prime the reagents by pressing Menu> Maint> Prime.
8) Restart the flow of sample water.